A primary reason to invest in international stocks is to diversify your portfolio to reduce its risk. If world markets do not move in perfect harmony, owning stocks from different countries should reduce the impact of a downturn in one stock market. But as investing becomes more global in nature, there is concern that stock markets are becoming more correlated.
What Is Correlation?
Correlation is a statistical measure of the extent to which one asset class moves in relation to another asset class. Correlations can range from +1 to -1. A correlation of +1 means the two assets move very closely together in the same direction. A correlation of -1 indicates the assets move in opposite directions, a rare event in the investment world. A correlation close to 0 means no relationship exists in the price movements of the two assets. Combining assets that aren’t highly correlated can help reduce volatility.
Correlations of International Markets
Almost all stock markets in the world are correlated to some degree, so correlations between stock markets will generally be positive. However, the closer that number is to 0, the less one market is impacted by the other. In general, European stock markets are more closely correlated to each other and the U.S. than to markets in Japan or Asia. Correlations between developed countries tend to be higher than correlations between developed and emerging countries.
But are stock market correlations around the world increasing? Major negative political or economic events, such as the oil embargo crisis, the U.S. stock market crash in 1987, the Gulf War in the 1990s, and the U.S. technology stock market decline, had repercussions in stock markets throughout the world. Recent research found that stock markets are more closely correlated during periods of recession than during periods of expansion. During U.S. recessions, the correlation between the U.S. stock market and the German stock market was 0.64, 0.69 for the United Kingdom stock market, and 0.60 for the Japanese stock market. During U.S. expansions, those correlations decreased to 0.51 for the German stock market, 0.55 for the United Kingdom stock market, and 0.34 for the Japanese stock market (Source: International Monetary Fund, September 2003).
Correlations can change significantly from year to year. For instance, in 1995 the correlation between the U.S. stock market and foreign stock markets went as low as 0.20, climbed to 0.6 by 1998, declined to 0.4 by 2000, spiked to 0.75 by 2002, and retreated some to 0.6 by 2003 (Source: International Monetary Fund, September 2003). Overall, between 1980 and 2003, the correlation between the Standard & Poor’s 500 (S&P 500) and foreign stocks was 0.7 (Source: Fortune & Misfortune, June 2004). This correlation is low enough for a diversified portfolio of international stocks to help reduce risk in a portfolio. Correlations change over time though, so these trends should be monitored.
Other Considerations
There are other reasons to consider international investing:
- Investment opportunities — The U.S. stock market now represents about half of the total value of global stocks, down from two-thirds in 1970. Of the 10 largest companies in the steel, electronics, and appliances industries, none are based in the U.S. (Source: The Washington Post, June 27, 2004). Limiting yourself to U.S. stock investments means eliminating half of the world’s investments from consideration.
- Return potential — During the 1990s, the U.S. stock market clearly outperformed international stocks. But that has not always been the case — international markets outperformed U.S. stocks during the 1980s. For 2002 and 2003, cumulative returns for the S&P 500 were 0.2%, while foreign stocks returned 16.5% (Source: Fortune & Misfortune, April 2004).* While no one knows whether this trend will continue in the future, there may now be opportunities to find investments in other parts of the world that are more attractively priced than those in the U.S.
- Currency fluctuations — Your return from an international investment is comprised of two components — the investment’s return in local dollars and the impact of any currency fluctuations. Currency fluctuations significantly impact total returns from foreign investments. Part of the reason U.S. investments dominated in the 1990s is due to the strong U.S. dollar. Recently, the U.S. dollar has weakened against many other currencies, helping to bolster returns of foreign investments.
Before investing in international stocks, assess how much of your portfolio to allocate to this asset class. This will depend on personal factors, such as your risk tolerance, time horizon for investing, and comfort level with foreign investing. Keep in mind that international investing may not be suitable for everyone. In addition to the risks associated with domestic investing, international investing has unique risks, including currency fluctuations, political and social changes, and greater share price volatility.
* The S&P 500 is an unmanaged weighted index generally considered representative of the U.S. stock market. The MSCI EAFE Index is an unmanaged index of 1,000 foreign stocks generally considered representative of stock markets outside the U.S. Past performance is not a guarantee of future results. This information is presented for illustrative purposes only. Investors cannot directly purchase an index.